Apparatus for exhausting the interior of rubber articles.



APPLICATION FILED DEC-1711915- Patented Sept. 26, 1916.

H/s ATTORNEY on 1G.

CHESTER J RAND QLL, 0F NAUGATUCK, CONNECTICUT, ASSIGNQR TO THE GOODYEAR/S METALLIC RUBBER SHOE (30., A CORPORATION OF GQNNEQTIGUT.

APPARATUS FOR EXHAUSTING THE INTERIOR OF RUBBER ARTICLES.

Specificationcf Letters Patent.

Application filed December 17, 1915. Serial No. 67,358.

To all whom it may concern:

Be it known that I, HEsTEIi J. RANDALL, a citizen of the United States, residing at Naugatuck, county of New Haven, and

State of Connecticut, have invented certainnew and useful Improvements in Apparatus for Exhausting the Interior of Rubber Articles, of which the following is a full, clear, and exact description.

This invention relates to apparatus for applying low pressure or vacuum to the interior of a rubber article supported upon a substantially impervious form, and has for an object to provide a simple and effective apparatus for enabling solid wood or other substantially impervious forms to be used in connection with the differential of pressure treatment of rubber articles of any type but especially those composed of a fabric lining and an outer covering of rubber..

The differential of pressure treatment of such a rubber article 'comprises in a general way the steps of first building to substantially final shape the article composed of a lining of fabric and an outer covering of I vulcanizable rubber, supporting the article upon a correspondingly shaped form, and compacting the walls of said article prior to or during vulcanization by subjecting it to an external pressure while communicating the fabric lining through the supporting form, which is hollow and-perforated for this purpose, with fluid pressure lower than the pressure exerted on the outer covering. This treatment has hitherto precluded the use of forms which were impervious or substantially so, such as for instance the solid wood forms upon which boots, shoes, etc., are built and vulcanized.

The present invention provides an apparatus designed especially to permit of substantially impervious forms being used in connection with a differential of pressure treatment, and to attain this end provides essentially means for entering between and holding the article and thefornr apart and i V communicating the inner surface of the article with the source of low pressure or vacuum, as will be hereinafter fully described. A

The invention can from f the following description taken in connection with the accompanying draw- 111g, in which the figure is a side elevation partly in section showing an apparatus embe readily understood bodying my improvements in operative position.

To specifically describe one type of apparatus suitable for carrying out the inven tion, I will describe the same in connection with the manufacture of a rubber boot. The boot 10 is built up on the form 11 in the usual manner, the preferred type of form employed being a solid wood one which is impervious or. substantially so, although any other form which is substantially impervious may be employed. The boot is built up of an outer covering 12 of vulcanizable rubber or allied gum, and a lining 13 of fibrous material, preferably woven or knitted fabric,.through the interstices of which the rubber may be most effectively brought into contact with the low pressure or vacuum of the differential of pressure treatment.

In carrying out the invention I preferably provide a metal cap 14: which is adapted to fit over the end of the boot form 11 inside of the edge of the boot preferably to be subsequently built thereon, the cap being provided with a tapered nozzle 15 adapted to fit over a correspondingly tapered nipple.

16 of a vacuum or low pressure pipe 17.

PatentedSept. 26, 1916.

vacuum or low pressure during application of the preponderating pressure on the outside of the article, a seal 21 is applied to lap the edge of the boot and form andassure a pressure-tight joint.

Although I have described but one em bodiment of the invention, it is to be understood that this is merely illustrative of the invention, and various modifications may be made within the scope of the claims without departing from the spirit or sacrificing any of the advantages of the intion.

Having thus described my invention in What I new claim as new and desire to protect by Letters Patent-is:

1. Apparatus for applying low pressure or vacuum to the interior of a rubber article supported upon a substantially, impervious form, comprising a vacuum or low pressure chamber, and means adapted to enter between and hold the article and the form apart and establish communication'be'tween the inner surface of the article and the copies of this patent may he obtained for apart and establish communication between the inner surface of the article and the chamber, and a stop adapted to engage the form and limit entrance of the conduit between the form and article. I

3. Apparatus for applying low pressure or vacuum to the interior of a rubber article supported upon a substantially impervious Signed at Naugatuck, Conn, this 4th day I of December, 1915.

CHESTER J; RANDALL.

five cents each, by addressing the Commissioner of Patents,

Washington, 3. C. 

